Crate r402_aptos 

Aptos chain support for the x402 payment protocol.

This crate implements the x402 "exact" scheme for Aptos: the buyer signs a 0x1::primary_fungible_store::transfer of a fungible asset, and a facilitator fee payer submits it after aptos-sdk 0.6 preflight.

Features

• CAIP-2 Addressing: aptos:1 (mainnet) and aptos:2 (testnet)
• Fungible Asset payments: exact primary_fungible_store::transfer
• Fee-payer sponsorship: extra.feePayer is copied from /supported
• In-process facilitator: verify and settle via aptos-sdk 0.6.0

Feature Flags

• server — server-side price tag generation
• client — client-side transfer signing
• facilitator — facilitator-side payment verification and settlement
• telemetry — tracing instrumentation

Re-exports

pub use chain::AptosChainProvider;facilitator

pub use chain::AptosFeePayer;facilitator

pub use chain::DecodedAptosPayload;client or facilitator

pub use chain::SimpleTransaction;client or facilitator

pub use chain::decode_aptos_payload;client or facilitator

pub use chain::encode_aptos_payload;client or facilitator

pub use exact::AptosExact;

pub use exact::client::AptosExactClient;client

pub use exact::client::AptosSigner;client

pub use exact::facilitator::AptosExactFacilitator;facilitator

pub use exact::facilitator::AptosExactFacilitatorConfig;facilitator

Modules

chain

Aptos chain support for x402 payments.

exact

Aptos "exact" payment scheme implementation.

Structs

USDC

Ergonomic accessors for USDC token deployments on well-known Aptos chains.

Constants

DEFAULT_CLIENT_MAX_GAS

Client max_gas_amount — Aptos SDK simple-tx default, under MAX_GAS_AMOUNT.

DEFAULT_GAS_UNIT_PRICE

Client gas_unit_price when estimate is unavailable.

DEFAULT_TOKEN_DECIMALS

Default USDC decimal precision.

EXPIRATION_BUFFER_SECONDS

Verify rejects expirations closer than this many seconds.

FUNGIBLE_ASSET_METADATA

Type argument on both transfer entry functions.

FUNGIBLE_ASSET_TRANSFER

0x1::fungible_asset::transfer (also accepted at verify).

MAX_GAS_AMOUNT

Sponsored-transaction cap on max_gas_amount (@x402/aptos MAX_GAS_AMOUNT).

MAX_GAS_UNIT_PRICE

Sponsored-transaction cap on gas_unit_price octas (MAX_GAS_UNIT_PRICE).

PRIMARY_FUNGIBLE_STORE_TRANSFER

0x1::primary_fungible_store::transfer (client-built path).

Statics

APTOS_NETWORKS

Well-known Aptos networks with their names and CAIP-2 identifiers.

Functions

usdc_aptos_deployment

Returns the USDC deployment for a specific Aptos chain, if known.

usdc_aptos_deployments

Returns all known USDC deployments on Aptos chains.